Help using randn and pskmod

I have taken random data using randn and then psk modulated it...But i get error.

M=1024;
m=4;
msg1=randn(M,1,m);
msg2=randn(M,1,m);
msg=vertcat(msg1,msg2);

% QPSK modulation

qpsk_modulated_data1=pskmod(msg1,m);
  qpsk_modulated_data2=pskmod(msg2,m);

[Daniel Shub]

What error?

[Janet]

Error using ==> pskmod

Elements of input X must be integers in [0, M-1].

Answer 1

[Wayne King]

You want to generate your data using randi() like this:

   M = 4;
   msg1 = randi([0, 3],1024,1);
   qpsk_modulated_data1 = pskmod(msg1,M);

[Janet]

i get errors

[Wayne King]

Janet, I have shown you how to use randi(), which is what you want. Please show what errors you get with the above.

[Janet]

Undefined command/function 'randi'.

[Thomas]

hmm.. randi is a built-in function..

can you do a

>>which randi

and give the output

[Janet]

am using matlab 7.0...there is no randi function

[Wayne King]

How about randint()

msg1 = randint(1024,1,[0,3]);

[Daniel Shub]

How about round(M*rand(1,m))

[Janet]

@wayne : i get using randint

Answer 2

[Daniel Shub]

You realize that

randn(M,1,m)

is not going to produce integers in the range [0, m-1]? Maybe you want

doc randi